High-efficiency heat sink

ABSTRACT

A high-efficiency heat sink includes a base and a plurality of heat sink fins A folded portion of each heat sink fin is formed by folding after being pressed and thinned, so that the thickness of the folded portion is less than the thickness of an insertion end of each heat sink fin. The thickness of the portion where the heat sink fin is inserted into a groove of the base is less than twice the thickness of the heat sink fin. It is beneficial to reduce the distance between two adjacent heat sink fins on the base, so that the heat sink fins can be arranged more densely, thereby improving the heat dissipation effect of the entire heat sink effectively.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a heat sink, and more particularly to a high-efficiency heat sink.

2. Description of the Prior Art

The heat sink fins and the base of a conventional heat sink are assembled together by soldering or by pressing. The heat sink fins are first inserted in the preset grooves or the clamping base, and then pressed by a press head so that the heat sink fins are clamped and combined with the grooves of the base. For example, as disclosed in U.S. Pat. No. 5,014,776, the respective two side walls of the grooves are pressed to cause a deformation to clamp the heat sink fins, such that the heat sink fins and the base are assembled together. In the above patent, through the deformation of both sides of the groove, the foot of the heat sink fin is clamped. However, the clamping force is concentrated on the deformation positions on both sides of the opening of the groove, only having two point-like clamping forces. Therefore, the clamping effect is not good and it is not easy to ensure its stable combination. The heat sink fins may have different heights, and the heat sink fins are prone to shaking or falling.

In these days, an improved heat sink is developed on the market. One end of each heat sink fin is reversely folded to form a folded portion, and the folded portion is pressed by a press head so that the heat sink fins and the base are assembled together. For example, Chinese Utility Model Application No. 201210029888.2 discloses an improved heat sink that is combined with heat sink fins by pressing. However, the folded portion is formed by directly folding the end of the heat sink fin. The thickness of the foot of the heat sink fin, embedded in the groove of the base, is twice the thickness of the heat sink fin, which seriously restricts the distance between two adjacent heat sink fins on the base. The heat sink fins cannot be arranged densely, which will affect the heat dissipation effect of the entire heat sink. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.

SUMMARY OF THE INVENTION

In view of the shortcomings of the prior art, the primary object of the present invention is to provide a high-efficiency heat sink, which can reduce the distance between two adjacent heat sink fins on a base, so that the heat sink fins can be arranged densely.

In order to achieve the above object, the present invention adopts the following technical solutions:

A high-efficiency heat sink comprises a base and a plurality of heat sink fins A surface of the base is formed with a plurality of spaced grooves for attachment of the heat sink fins Each of the heat sink fins has an insertion end. The insertion end is reversely folded and extends to form a folded portion. The folded portion is formed by folding after being pressed and thinned. The folded portion has a thickness less than that of the insertion end. The folded portion and the insertion end are fitted and embedded into a corresponding one of the grooves of the base.

Wherein, after the folded portion of each heat sink fin is inserted into the corresponding groove of the base, a press head is aligned with the folded portion for pressing, the press head covers the folded portion. After pressing, the folded portion is pressed down in the corresponding groove to be deformed, expanded and coupled into the corresponding groove so that the heat sink fins are combined with the base.

Preferably, the press head has a press bevel that partially covers the folded portion and a side wall of the corresponding groove simultaneously. The press bevel presses the side wall of the corresponding groove to cause a deformation so that the deformed side wall of the corresponding groove is pressed against the folded portion.

Preferably, before folding, a first side of the folded portion is recessed relative to a first side of the insertion end, and a second side of the folded portion is flush with a second side of the insertion end. After folding, the second side of the folded portion is overlapped with the second side of the insertion end.

Preferably, each of the heat sink fins has a main body. The main body is provided with an accommodating groove penetrating through two ends of the main body for filling a cooling liquid.

Preferably, the accommodating groove is plural and arranged in parallel and spaced apart from each other.

Preferably, a bottom end surface of the base is formed with at least one engaging groove for attachment of a heat pipe. The heat pipe has a flat bottom surface that is exposed to the bottom surface of the base.

Preferably, the heat pipe is bent to pass through the plurality of heat sink fins to form a tight combination.

Preferably, the base has a circular shape. A peripheral wall surface of the base is formed with the plurality of grooves spaced axially for attachment of the plurality of heat sink fins.

The present invention has obvious advantages and beneficial effects compared with the prior art. Specifically, it can be known from the above technical solutions:

The folded portion is formed by folding after being pressed and thinned, so that the thickness of the folded portion is less than the thickness of the insertion end. The thickness of the portion where the heat sink fin is inserted into the groove is less than twice the thickness of the heat sink fin. It is beneficial to reduce the distance between two adjacent heat sink fins on the base, so that the heat sink fins can be arranged more densely, thereby improving the heat dissipation effect of the entire heat sink effectively.

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the present invention before pressing and bonding;

FIG. 2 is a front view of the present invention before pressing and bonding;

FIG. 3 is a front view of the present invention after pressing and bonding;

FIG. 4 is an enlarged view of circle A of FIG. 3;

FIG. 5 is a perspective view of the heat sink of the present invention combined with the heat pipe;

FIG. 6 is another perspective view of FIG. 5;

FIG. 7 is a perspective view of the heat sink fin of the present invention before being pressed and thinned;

FIG. 8 is a perspective view of the heat sink fin of the present invention after being pressed and thinned;

FIG. 9 is a perspective view of the heat sink fin of the present invention after being folded;

FIG. 10 is an enlarged view of circle B of FIG. 8;

FIG. 11 is an enlarged view of circle C of FIG. 9;

FIG. 12 is a perspective view of another example of the present invention before pressing and bonding, wherein the base has a circular shape;

FIG. 13 is a perspective view of another example of the present invention after pressing and bonding, wherein the base has a circular shape;

FIG. 14 is an enlarged view of circle D of FIG. 13;

FIG. 15 is a perspective view of another example of the heat sink fin of the present invention after being pressed and thinned, not being folded;

FIG. 16 is an enlarged view of circle E of FIG. 15;

FIG. 17 is a side view of another example of the heat sink fin of the present invention; and

FIG. 18 is an enlarged view of circle F of FIG. 17.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 1 through FIG. 18, a specific structure in accordance with a preferred embodiment of the present invention is shown, comprising a base 10 and a plurality of heat sink fins 20.

The surface of the base 10 is formed with a plurality of spaced grooves 11 for attachment of the heat sink fins 20.

An insertion end 21 of each heat sink fin 20 is reversely folded and extends to form a folded portion 22. The folded portion 22 is formed by folding after being pressed and thinned. The thickness of the folded portion 22 is less than the thickness of the insertion end 21. The folded portion 22 and the insertion end 21 are fitted and embedded into a corresponding one of the grooves 11 of the base 10.

Through the base 10 and the plurality of heat sink fins 20, after the folded portion 22 of each heat sink fin 20 is inserted into the corresponding groove 11 of the base 10, a press head 40 is aligned with the folded portion 22 for pressing. The press head 40 covers the folded portion 22. After pressing, the folded portion 22 is pressed down in the corresponding groove 11 to be deformed, expanded and coupled into the corresponding groove 11 tightly so that the heat sink fins 20 are combined with the base 10. In this embodiment, the press head 40 has a press bevel 41 that partially covers the folded portion 22 and the side wall of the corresponding groove 11 simultaneously. The press bevel 41 presses the side wall of the corresponding groove 11 to cause a deformation, so that the deformed side wall of the corresponding groove 11 is pressed against the folded portion 22.

As shown in FIG. 8 and FIG. 10, before folding, a first side of the folded portion 22 is recessed relative to a first side of the insertion end 21, and a second side of the folded portion 22 is flush with a second side of the insertion end 21. After folding, as shown in FIG. 9 and FIG. 11, the second side of the folded portion 22 is overlapped with the second side of the insertion end 21. The thickness of the folded portion 22 is half the thickness of the insertion end 21. The width of the corresponding groove 11 is slightly greater than the thickness of the folded portion 22 plus the thickness of the insertion end 22.

As shown in FIG. 5 and FIG. 6, the bottom end surface of the base 10 is formed with at least one engaging groove 12 for attachment of a heat pipe 30. The heat pipe 30 has a flat bottom surface 31 that is exposed to the bottom surface of the base 10. The heat pipe 30 is bent to pass through the plurality of heat sink fins 20 to form a tight combination.

As shown in FIG. 12 to FIG. 14, the base 10 has a circular shape. The peripheral wall surface of the base 10 is formed with the plurality of grooves 11 spaced axially for attachment of the plurality of heat sink fins 20. The heat sink fins 20 are firmly inserted and fitted into the peripheral wall surface of the circular base 10 in a radial direction.

As shown in FIG. 15 to FIG. 18, each heat sink fin 20 has a main body 23. The main body 23 is provided with accommodating grooves 201 penetrating through two ends of the main body 23 for filling a cooling liquid. The accommodating grooves 201 are arranged in parallel and spaced apart from each other to improve heat dissipation efficiency.

The feature of the present invention is that the folded portion is formed by folding after being pressed and thinned, so that the thickness of the folded portion is less than the thickness of the insertion end. The thickness of the portion where the heat sink fin is inserted into the groove is less than twice the thickness of the heat sink fin. It is beneficial to reduce the distance between two adjacent heat sink fins on the base, so that the heat sink fins can be arranged more densely, thereby improving the heat dissipation effect of the entire heat sink effectively.

Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims 

What is claimed is:
 1. A high-efficiency heat sink, comprising a base and a plurality of heat sink fins, a surface of the base being formed with a plurality of spaced grooves for attachment of the heat sink fins, each of the heat sink fins having an insertion end, the insertion end being reversely folded and extending to form a folded portion, the folded portion being formed by folding after being pressed and thinned, the folded portion having a thickness less than that of the insertion end, the folded portion and the insertion end being fitted and embedded into a corresponding one of the grooves of the base; wherein after the folded portion of each heat sink fin is inserted into the corresponding groove of the base, a press head is aligned with the folded portion for pressing, the press head covers the folded portion, after pressing, the folded portion is pressed down in the corresponding groove to be deformed, expanded and coupled into the corresponding groove so that the heat sink fins are combined with the base.
 2. The high-efficiency heat sink as claimed in claim 1, wherein the press head has a press bevel that partially covers the folded portion and a side wall of the corresponding groove simultaneously, and the press bevel presses the side wall of the corresponding groove to cause a deformation so that the deformed side wall of the corresponding groove is pressed against the folded portion.
 3. The high-efficiency heat sink as claimed in claim 1, wherein before folding, a first side of the folded portion is recessed relative to a first side of the insertion end, and a second side of the folded portion is flush with a second side of the insertion end; after folding, the second side of the folded portion is overlapped with the second side of the insertion end.
 4. The high-efficiency heat sink as claimed in claim 1, wherein each of the heat sink fins has a main body, and the main body is provided with an accommodating groove penetrating through two ends of the main body for filling a cooling liquid.
 5. The high-efficiency heat sink as claimed in claim 4, wherein the accommodating groove is plural and arranged in parallel and spaced apart from each other.
 6. The high-efficiency heat sink as claimed in claim 1, wherein a bottom end surface of the base is formed with at least one engaging groove for attachment of a heat pipe, and the heat pipe has a flat bottom surface that is exposed to the bottom surface of the base.
 7. The high-efficiency heat sink as claimed in claim 6, wherein the heat pipe is bent to pass through the plurality of heat sink fins to form a tight combination.
 8. The high-efficiency heat sink as claimed in claim 1, wherein the base has a circular shape, and a peripheral wall surface of the base is formed with the plurality of grooves spaced axially for attachment of the plurality of heat sink fins. 